Trip to Mars would likely exceed radiation limits for astronauts

May 31, 2013 3:18 PM

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Results taken during Curiosity's eight-month cruise to Mars indicate that astronauts would receive a radiation dose of about 660 millisieverts during a 360-day roundtrip flight, the fastest travel possible with today's chemical rockets. That dosage does not include any time spent on the planet's surface. A millisievert is a measurement of radiation exposure.

NASA limits astronauts' increased cancer risk to 3 percent, which translates to a cumulative radiation dose of between about 800 millisieverts and 1,200 millisieverts, depending on a person's age, gender and other factors.

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